Age, school, hometown, what do you do for living, married or single or having bf friend, girl friend etc.. etc mostly personal things to know each other. You're gonna be really uncomfortable to talk with Koreans at the first time. They will ask you if you ate meal. Like 식사 하셨어요? 밥 먹었요? 밥 먹었냐? Please don't be offended. Its just greeting to them.